Design of a through-the-air staircase

Quick answer：

Through-the-air staircase design refers to an architectural style where the staircase is designed to appear as if it is floating through the space, often using glass or metal structures to create the illusion of openness and space. This design approach is often used in modern and contemporary buildings to create a sense of lightness and elegance. It requires careful planning and structural engineering to ensure safety and stability.